Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statements of Comprehensive Income [Abstract]
Net income	$ 37,773	$ 48,014	$ 25,243
Other comprehensive income (loss):
Net unrealized gain (loss) on RMBS	(43,820)	2,948	(4,797)
Reclassification of net realized gain on RMBS included in earnings	8,362	503	(1,399)
Other comprehensive income (loss)	(35,458)	3,451	(6,196)
Comprehensive income	2,315	51,465	19,047
Comprehensive income attributable to noncontrolling interests in Operating Partnership	30	702	311
Dividends on preferred stock	5,297	1,833	0
Comprehensive income (loss) attributable to common stockholders	$ (3,012)	$ 48,930	$ 18,736